Surgical and dental chair



E. BERNINGHAUS SURGICAL AND DENTAL CHAIR 2 Sheets-Sheet. 1

Filed Sept; 16 192] snow Roz Sept. 30. I924. 1,519,376

- E. BERNINGHAUS SURGICAL AND DENTAL CHAIR Filed Sept. 16. 1921 2 Sheets-Sheet 2 Patented Sept. '30, 1924.

stares initiate earner enrich.

EUGENE BERNINGHAUS, OF CINCINNATI, OHIO, ASSIGNOR TO THE EUGENE BERNING- HAUS COMPANY, OF CINCINNATI, OHIO, A CORPORATION OF OHIO.

SURGICAL AND DENTAL CHAIR.

Application filed September is to provide an improved surgical chair having a variety of adjustments adapting it to be used for a large variety of examinations and minor operations. Another object is to provide an improved chair back and means for mounting and adjusting the same. Another object is to provide for a releasable connection between the arms and foot board and the back whereby the back may be adjusted to a horizontal or nearly horizontal position without corresponding movement of the arms and foot board. Another object is to provide for a substantially horizontal position of the back in a substantial plane with the chair seat. and a foot board memher also adjustable into a substantially horizontal plane with the face of the seat and back. Another object is to provide improved means to hold the back adjusting means in either released-position or in automatic gripping position. My invention also comprises certain details of form. combination and arrangement, all of which will be fully set forth in the description of the accompanying drawings, in which;

Fig. 1 is a perspective view of a surgical chair embodying my improvements.

Fig. 2, is a side elevation of a portion of the chair shown in Fig. 1, and in a different position of adjustment.

Fig. 3, isv a horizontal sectional detail partly in section on line 83 of Fig. 2.

Fig. 4. is a perspective view of the looking hand wheel detached.

Fig. 5, is aperspective view of one of the detachable links detached.

Fig. 6, is a perspective view of one of the back supporting brackets detached.

1 Fig. 7, is a perspectiveview of a releasing dog detached.

8, is a plan view of the head rest and shoulder stays detached. 1

The accompanying-drawings illustrate the preferred embodiment of my invention in 16, 1921. Serial No. 501,170.

which 1 1 represents the base, 15 represents a plunger or standard seated in a cylinder located in the base and hydraulically and vertically adjustable relative to said base through the operation of a hand lever 16.

j The hand lever 16 also preferably has a position of adjustment at which the plunger is rigidly locked to the base against movement either vertically or rotatably, thereby providing for adjusting the plunger either vertically or rotatably to secure a convenient position. and suitable illumination of the chair and then looking the plunger rigidly to its adjusted position.

A chair seat frame 17 provided with an upholstered seat 18 is rigidly mounted upon the plunger 15.- The seat frame is provided with upwardly projecting forward brackets 19 and rearward brackets 20. A foot rest frame 21 provided with a foot rest 22, and also preferably with an adjustable. and 'detachable auxiliary foot rest 24, is pivotally attached to and suspended from the forward brackets 19. A chair back 25 is provided with side brackets 26 the projecting ends of which are pivotally attached to the free ends of the rearward brackets 20, sothat the chair back has a range of adjustment of more than ninety degrees upon said rearward brackets, that is from a substantially horizontal or slightly inc-lined position where it is substantially in the same plane with the seat to a substantially vertical position at nearly right angles to the seat.

A pair of chair arms 27 and 28 are respectively pivotally attached at their forward ends at 30 to the upper ends of the side bars 29 of the foot rest frame 21. At the rear ends the arms 27 and 28 are respectively pivotally attached to the free ends of the rearward arms 20 by means of links 31. Thus as the foot rest frame 21 is rocked upon its pivotal connections with the brackets 19 the arms 27 and 28 are also rocked endwise due to their pivotal connection with the arms 29 of the foot rest frame 21. As illustrated in Fig. 1 the back is not directly connected to the rear ends of the chair arms, and hence the chairback as shown in Fig. 1 has a wider range of adjustment than it would have if connected up by means of the links or connecting arms 32 and 33 with the rear ends of the chair arms 27 and 28 as illustrated for instance in Fig. 2. When the back 25, arms 27 and .28 and ,foot rest frame 21 areiall linked up together, any adjustment of the back 25 will result in a corresponding adj ustment of the arms 27 and 28 and foot rest frame-'21. For somepurposes itis desirable to have thearms and foot .r'est'connected to the back, and for other purposes it is noi'e desirable to have the arms and foot rest disconnected from the back so that the back may be adjusted over a wider range.

In order to provide for conveniently and reliably connecting and disconnecting the chair back to the chair arms I provide a horizontal shaft 34 journalednear opposite ends in the bracket members 26 of the chair back. The projecting ends of said shaft 34 are provided with collars and 36 rigidly mounted on the shaft 34 and each provided with a segmental projection 37. The collar 35 is provided with a hand wheel or hand grip 38 to enable the shaft 34 to be manually rotated through a portion of a revolution. Pivotally mounted upon the rear ends of the arms 27 and 28 are the arms or links 32 and 33, which when disconnected from the back 25 are held in an inclined position as shown in .Figf 1, by engagementl with studs or stop pins 39 carried by the links 31. The arms 32 and 33 are thus prevented from falling into a substantially vertical position along side the links 31, and the free ends of arms 32 and 33 are held in position to be automatically engaged by cam ledges carried respectivelyby the brackets 26, which ledges constitute inclined guides to receive the forked free ends of the arms 32 and 33 and to guide them into position and engagement with the shaft 34 between the sides of the bracket members 26 and the inner ends of the collars 35 and 36 so as to bring the segmental projections 41 carried by the arms 32 and 33 into position to be engaged by the projections 37 to firmly lock the arms rotatablv in engagement with ,the shaft '34 by partially rotating the shaft 34 so as to bring 'the projections 41 into a position between the t 34 and the projections 37 as shown n Fig. 3. A partial rotation of the shaft '34 in'fthe opposite direction will serve to release-the ,arms 32 and 33 from the shaft 34.

VVhen the arms 32 and 33 are locked to .the

back, the, back 25 has a more limited range of adjustment than when said arms 32 and 33 are disconnected from the back, and also any adjustment of the back results in a corresponding adjustment of the arms 27 maize and foot rest .frame 21.

" Hi nged at 42 to the rear of the back 25 is a depending rod 43 which passes over the face of an inclined projection 44 carried rigidly by the seat frame 17. A yoke shaped rn'jeniber'45 is pivotally attached at 46 to the projection 44 and tendsiby gravity to auto.-

matically clamp'the rod 43 between the loop the projection 44.

Thus the back may be raised to any desired height and the yoke will automatically clamp upon the'rod 43 to locktheback to its adjusted position. To lower the back the handle 47 of the yoke 45 is lifted to release the rod 43, and allow the back to be lowered. When desired to hold the yoke 45 in its 'raised position a dog 48 pivotally attached to an car 49 on the projection 44 is adjusted into position sothat the nose 50 of the dog enters beneath the loop portion of the yoke 45 and holds the yoke 45 in raised position for any desired length of, time during which the back 25 may be freely moved up or down. The dog is-adapted .to be operated by hand or by the knee of the operator in either direction, thus leaving the hands free for other purposes.

erably provided with an indentation 52 which provides for a more extended range the rear of the back, and in which .the shank is adjustable endwise and also to a limited extent rotatably. Set screws 56 and 57 rigidly clamp the shank 53 in its adjusted position. A segment 58 is pivota llyconnectcd to the upper end of the shank 53,.and has a curved slot 59 through which a stud shaft projects from. the shank .53 to receive a clamping nut 60 to look the segment 58 to the shank 53. The segment '58 carries rigidly two upholstered head-rest pads 61 d ich ar ediu a lethrens a Wi range to support the ,headgof a patient in any desired position for examination and operation. A pair of shoulder stays 63 and 64 are mounted upon a forkedfshauk 65 which slides in a groove 66 in the segment 58. The shank 65 is provided with a series of perforations 67 .to register se l ectively with a. perforation 68in the segment 58. A

pin having a stem to seat int he perforation 68 and an enlarged head 69is adapted to also pass through any one .of .theperforations 67 to lock the shank 65 to theseg mentps. The shoulder stays are adapted to be employed to hold the shoulders of a patient in position. I i i i i A foot rest 22 is adjustablyanounted upon the foot-rest frame :21. A "socket 171 on the foot-rest is adapted to receive and adjust upon the supplemental foot-rest "is adapted to beadjusted into a horizontal plane with the upper face of the seat "or any lower position as maybe desired. V v i The apparatus herein illustrated and de- ,se The upper portion of the back is prefscribed is capable of considerable modifica tion without departing from the spirit of my invention. 7

What I claim is:

1. A surgical chair comprising a base a. vertically and rotatably adjustable seat, a chair back having a medial recess at its upper end to receive and afiord a wider range of adjustment for a head rest, a head rest longitudinally and rotatably mounted relative to said back and adapted to enter said medial recess, and means to lock said back to any position of adjustment relative to said seat, said back being adjustable substantially into a horizontal plane with the upper face of said seat.

2. A surgical chair comprising a base a vertically and rotatably adjustable seat, a chair back having a medial recess at its upper end to receive and afio-rd a wider range of adjustment for a head rest, a head rest longitudinally and rotatably mounted relative to said back and adapted to enter said medial recess, means to lock said back to any position of adjustment relative to said seat, and a vertically adjustable foot rest carried by said seat, said back and foot rest being adjustable substantially into a horizontal plane with the upper face of said seat.

3. An operating chair comprising a chair seat, a chair back provided with a medial recess extending downwardly from the upper end of the chair back and through from front to rear of the chair back, an adjustable member to be supported upon and relative to the chair back in substan tially vertical alignment with said medial recess and adapted to enter said medial recess, a supporting shank upon which said adjustable member is mounted, and means carried by said chair back to adjustably support said shank relative to the chair back.

4. An operating chair comprising a chair seat, and a chair back, said chair back being provided with a medial recess extending downwardly from the upper end of the chair back and through from front to rear of the chair back, and aifording a passageway through which a head supporting member may project.

5. A surgical chair comprising a base, a

tions of inclination relative to said foot rest, means to detachably connect the chair back to the rear ends of said chair arms to enable said back to be adjusted either inde pendently of said arms and foot rest, or in conjunction with said arms and foot rest, comprising links pivotally attached to the rear ends of the chair arms at one end and forked and provided with laterally extending locking projections at their opposite ends, and a rotatable shaft carried by said chair back and provided with projections ro tatable therewith to engage respectively with the forked end of said links and said laterally eXtended locking projections thereon to positively lock said links in pivotal relation with the shaft and rotatable projections carried by said chair back.

6. A surgical chair comprising a base, a seat mounted thereon, chair arms at opposite sides of said seat, a chair back pivotally connected to said seat and adjustable from a substantially vertical position to a position in substantially the same horizontal plane with the face of said seat, a locking bar pivotally attached to said chair back with one face in contact with a projection carried rigidly relative to said chair seat, a gravity actuated yoke pivotally connected to said projection at opposite ends and with its middle portion in engagement with the opposite face of said. locking bar to normally automatically engage and lock said locking bar to said projection, and a releasing member manually adjustable into and out of engagement with said yoke to sup port the weight of said yoke when desired and hold said yoke out of locking engagement with said locking bar.

In testimony whereof I have afliXed my signature.

EUGENE BERNINGHAUS. 

